Process of producing calcium pyrophosphate and ammonia.



rnnnnarox reunions, or ST. LOUIS, iviissoimr,

PROCESS OF rnonncmo enema PYROPHOSPHATE Ann AMMONIA;

Specification of Letters Patent.

Patented Aug. 29,. 1911 No Drawing. Original application filed August20, 1910, Serial No. 578,226. Divided and this application filedApril'19, 1911. Serial No. 622,032.

To all whom it may concern:

Be it known that I, Fnn'nnmcn W. Far:-

mcns, a citizen of the United States, residmg at St. LOUIS; in the Stateof Missouri,

- with:

F ormu-la A.

The reaction takes place by simply mixing the materials at ordinarytemperature.- In the production of ammonia from am-- moniuin sulfate andcaustic lime, ammonia is liberated and the sulfuric acid combined withthe lime'to make gypsum which is ralueless and goes to waste by:

Formula 0. (P0 I )E a'l' (NI-I4) 2 4 (PO H Ca+2CaSO +4NH It is evidentthat in the reaction represented by Formula C the same result isobtained as in the two reactions represented by Formulae A. and B w ththe exception that all the sulfuric acid is saved which was wasted byreaction A. and all the lime "which was Wasted by reaction B 'Ihissaving is very large and makes the process very economical. Reaction Ccannot, however, apparently be carried out in a direct way, but it'canbe accomplished by a combination of successive operations as follows: Byroasting a mixture made in the proportion of one molecular weightcalcium phosphate and one molecular Weight, ammonium sulfate to 250 CQammonia commences to be liberated. By increasing th e'temperat-uregradually to 343 C. (650 F.) aboiit one-half of the ammonia present inthe mixture isset free and the second half of the ammonia-can beliberated by gradually increasing the temperature to .500 C.lVhile'.ammoniabegins to be lib erated'at. 250 C. it amounts to onlya'very small percentage and practically all the ammonia is liberatedafter the mass reaches a temperature above 343 G1, a number'ofl'GtlCllOYlS taklng place which may be represented by the following:

Formula F p.

Calcium pyrophosphate and ammonia are obtained as resulting products ofFormula D. the firstfiof whiclrmay be readily used for fertilizermaterial by treating it with sulfuric acid and water in accordance with:v

Formula E .7

Rol ed-(laSO +H SO +H O= ronn oweoaso sulfate, gradually raising thetemperature from normal to a temperature 1n excessof '1 1 650 F. untilthe major portionof the am- 1 monia content has been liberated and themajor portion of the calcium-phosphatehas i been converted into calciumpyrophosphote.

' In testimony whereof I aflix my signature in presence of twowitnesses.

FREDERICK W. FRERICHS.

Witnesses L. L. .MonRILL, NANNIE MEEM.

